JPS5996637A - Manufacture of cathode-ray tube - Google Patents

Abstract

PURPOSE:To obtain excellent adhesiveness by a method wherein a photohardening resin for adhesion is injected while keeping the front glass in the prescribed distance from the face plate part, the hardening is made to progress in the beginning with ultraviolet rays of low energy while being thereafter completely hardened by intensifying of ultraviolet rays. CONSTITUTION:The front glass 2 is mounted on the face plate part 1 through a synthetic resin tape 3 at the prescribed interval. At this time, an injection port 4 is mounted on one part of the tape 3 while positioning between the plate part 1 and the glass 2 whereby the part into which an injection jig 6 of the injection port 4 is to be cut off. Subsequently, a photosetting resin 11 is made to extrude from an extruder 12 to be injected into the injection port 4 through the jig 6. The injection port 4 is blocked up after injection. Then, the ultraviolet rays are evenly applied from the glass 2 side and from the side in order to harden the resin 11. At this time, the weak ultraviolet rays L1 of 0.1-6mW/cm<2> is applied for 5-10min to the resin 11 to promote hardening. Thereafter, the ultraviolet rays L2 of 10-30mW/cm<2> are applied to the resin 11 for 1-4min to completely harden it by enhancing the intensity. Thereby, excellent adhesiveness can be obtained while improving productivity.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a front glass adhesive type cathode ray tube in which a front glass is adhered to a cathode ray tube face plate.

Conventionally, this type of cathode ray tube has an unsaturated polyester resin (
5) was used to adhere the front glass [2).

Here, in order to explain the structure, a method for manufacturing a cathode ray tube with front glass bonded using unsaturated polyester resin (5) will be briefly described.

As shown in FIG.
) while maintaining a predetermined distance (1 to 3 m/m) between the front glass (2) and the cathode ray tube face plate (1) by wrapping them together with a synthetic resin tape (3) to integrate them. let The protruding part of the tape (8) is attached to the @ side glass (
2) Fold it to the convex side. Furthermore, at this time the tape (
A resin injection port (4) is attached to a part of the tube 8) so as to be located between the cathode ray tube face plate portion (1) and the front glass (2). Cut off the tape (3) at the part of the injection port (4) into which the injection jig [6] (Fig. 6) is inserted.

Next, as shown in Figure 6, attach the injection jig (6) to the above injection tube (4), and then attach the mixer (6) to this jig (6).
7) Connect. On the other hand, unsaturated polyester resin I before curing
JW! 9) G, for example, naphthenic acid (
0.02% of 6% chloride was added, and methyl ethyl ketone peroxide + 10) (curing agent) was added in an amount of 2% of Permeku 11 based on the resin (9). Then, while discharging the resin (9) and curing agent (0) from the dispenser (8), the injection port (
4) Inject into the body. When this injection work is completed, make sure that the resin (9) does not leak out from the injection port (4).
) is closed with a cap (not shown). At this time, it is necessary to preheat the cathode ray tube face plate portion (1) side to the same temperature as the curing temperature so that the resin (9) is uniformly cured. Thereafter, as shown by arrow H in FIG. 4, the entire Yin-Yang ray tube is heated to 40 to 70°C to harden the resin (9), and the front-facing glass (2) is attached to the cathode-ray tube face plate (1). was firmly attached.

However, according to this method, unsaturated polyester resin (Il+ has a relatively high viscosity of 600 to 800 cps and is difficult to defoam, and the injection requires a certain amount of resin (9) and curing agent UO). Dispenser that dispenses in batches (8)
A mixer (7) with sufficient mixing effect is required.

The ratio of the curing agent 110) to the resin (9)O is a few percent, but if the ratio of the resin (9) and the curing agent 110) changes from the predetermined conditions, curing distortion tends to occur (locally The hardening distortion that occurs becomes a lens effect, and when the cathode ray tube is operated,
Since it appears on the i-side and damages the value of the product, strict management is required.

Further, careful attention must be paid to the mixing of the resin (9) and curing agent no. Several percent of hardening agent (1
0) must be stirred evenly throughout. Incomplete mixing also tends to cause curing distortion. If curing distortion occurs partially, it may peel off (from the glass surface) due to differences in adhesive strength with other parts.

Unsaturated polyester resin (9) with addition of curing agent (1O)
) begins to gel after a few minutes. For this purpose, the resin (9) with a hardening agent added is placed in the mixer (7) including the injection jig (6).
Since it cannot be retained in subsequent circuits, it is always necessary to waste it to prevent it from hardening in the circuit.

It needs to be cured slowly over an hour or so.

In this way, the front glass (2) and cathode ray tube face plate part (2) are made of thermosetting unsaturated polyester resin (9).
1) Temperature control and dispenser (
8) and the mixer (7) require a great deal of cost and time, but the results are not sufficiently effective.

This invention was made to overcome the above-mentioned drawbacks of the prior art.After injecting a low-viscosity, one-component photocurable resin between the negative ray tube face plate and the front glass, At the stage of curing by irradiating ultraviolet rays, curing progresses first with weak energy ultraviolet rays, and then complete curing with strong energy ultraviolet rays, which not only improves workability but also achieves good adhesion in a short time. It is an object of the present invention to provide a method for manufacturing cathode ray tubes that can be obtained with high material yield.

An embodiment of the present invention will be described below with reference to the drawings.

First, as shown in Figure 2, the face plate section of the cathode ray tube (
Attach the front glass (2) to 1) at a predetermined interval (1 to 3 m/m) via a synthetic resin tape (8).

At this time, attach the inlet (4) to a part of the tape (3) between the cathode ray tube face plate (1) and the front glass (2). The insertion part of the injection jig (6) is cut off.Up to this point, the method is the same as the conventional method.

Next, as shown in FIG.
). Once the injection process is complete, open the injection port (4)
is occluded with a cap (not shown). The one-component photocurable resin (1) used in this invention is a photocurable resin containing gold as a photocuring initiator. This is the resin composition,
Depending on the type and amount of the photocuring initiator, arbitrary characteristics can be obtained, but from the viewpoint of workability during resin injection, the viscosity is 25.
Preferably, the temperature is in the range of 10 to 500 centivoise at °C. Also, due to optical characteristics, the refractive index is 1.45 to 1.5.
5, it is preferable that the visible region robustness is 85% or more and the single curing shrinkage rate is 5% or less. In addition, due to thermal shock characteristics, the glass transition temperature of resin (IJ) is -20°C to -60°C.
It is preferable that it is in the range of . Due to these required characteristics, polyester acrylate and polyether acrylate
1-Resin is recommended.

After injecting the resin (11) between the cathode ray tube face plate (1) and the front glass (2), ultraviolet rays of 300 to 400 nm are applied to the front glass (2) as shown in Figure 6.
The resin (1) is cured by uniformly irradiating from both sides. At this time, the resin (IJ) is first irradiated with weak ultraviolet light L1 of 0.1 to 6 (mw/cJ) for 5 to 10 minutes to advance curing, and then the intensity is increased as shown in Figure 7.
(mw/CrI) of ultraviolet light L2 to the resin (11)
Irradiate for ~4 minutes to fully cure this. In other words, resin (
1j) is cured in two stages.

By the way, the photocurable resin (11) has a photocuring initiator uniformly mixed and dissolved in advance, so local curing distortion is unlikely to occur, but if it is rapidly cured with strong ultraviolet rays, curing distortion will occur and the optical properties will be poor. Become. In addition, strong ultraviolet rays require a large amount of energy for the irradiation equipment and also require close attention to the safety and health of the working environment.

However, according to the method of this invention, the ultraviolet light L is initially weak.
In step 1, the photocurable resin (11) is almost cured, and then it is completely cured by being exposed to strong ultraviolet light for a short period of time, so no curing distortion occurs, and the irradiation time with strong ultraviolet light L2 is shortened as much as possible. This not only saves energy, but also ensures the safety and health of the working environment. In addition, the photocurable resin (11) does not cause uneven curing caused by variations in the resin and curing agent or insufficient mixing, which is common in two-component mixtures such as conventional unsaturated polyester resins. Dispensers (quantitative dispensing machines) and mixers are also not required. Further, since only the necessary amount of the resin (IJ) is used, the yield is good. Furthermore, since heating for preheating and curing of the cathode ray tube body and the resin (11) is not required, it is possible to save energy and significantly shorten the production time.

As shown in Figure 8, the energy intensity of ultraviolet rays for the photocurable resin (11) starts from Q (mw/d), and then linearly increases, for example, 3 (my
/cJ)/ The strength may be gradually increased continuously at an incline of 1 minute for complete hardening.

As described above, according to the present invention, a photocurable resin is used to bond the cathode ray tube face plate portion and the front glass,
When curing this resin with ultraviolet rays, by setting the ultraviolet energy intensity to be low at first and then high (later), we provide a method for manufacturing cathode ray tubes that has excellent adhesive properties and can contribute to improved productivity. be able to.

[Brief explanation of drawings]

Figure 1 is a partially cutaway cross-sectional view of a conventional OIJ front glass adhesive type cathode ray tube, and Figure 2 is a cathode ray tube faceplate with front glass attached at a predetermined distance using synthetic resin tape. A front view of the state, Fig. 6 is a schematic configuration diagram of the device used when injecting resin by the conventional method, Fig. 4 is an explanatory diagram when curing the resin by the conventional method, and Fig. 5 is the present invention. 6 and 7 are explanatory diagrams for curing resin by the method of the present invention, and FIG. 8 is a diagram showing another example of ultraviolet ray irradiation. It is an ultraviolet light intensity/time characteristic diagram. (1)...Cathode ray tube face plate section, (2)...
・Front glass, (11)...photocurable resin before curing,
"＋＋"Q...Ultraviolet light. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Makoto Kuzuno (1 other person) Figure 1 Figure 2 Figure 3 Figure 5 Figure 2 Figure 7 Figure 8 Time (minutes) □

Claims (2)

[Claims] (1) A front glass is placed at a predetermined distance from the cathode ray tube face plate, a photocurable resin for bonding is injected between the two, and the photocurable resin is irradiated with ultraviolet rays. A method for manufacturing a cathode ray tube, which is characterized in that when curing the resin, the curing is initially progressed with low-energy ultraviolet rays, and then the energy of the ultraviolet rays is increased to completely cure the resin. (2) The method for manufacturing a cathode ray tube according to claim 1, wherein the energy of the ultraviolet rays applied to the photocurable resin is gradually increased continuously starting from a low energy.